#pragma once
#include <assert.h>
#include <iostream>
using namespace std;

class Date
{

	friend ostream& operator<<(ostream& out, const Date& d);
	friend istream& operator>>(istream& in, Date& d);

public:
	Date(int year = 1900, int month = 1, int day = 1);
	void Print() const;

	int GetMonthDay(int year, int month)
	{
		assert(month > 0 && month < 13);

		int MonthDayArray[13] = { -1,31,28,31,30,31,30,31,31,30,31,30,31 };

		if (((month == 2) && ((year % 4 == 0) && (year % 100 != 0))) || (year % 400 == 0))
		{
			return 29;
		}
		else
		{
			return MonthDayArray[month];
		}
	}

	bool CheckDate()
	{
		if (_month < 0 || _month >12)
		{
			return false;
		}
		if (_day < 1 || _day>(GetMonthDay(_year, _month)));
		{
			return false;
		}

		return true;
	}

	bool operator<(const Date& d);
	bool operator<=(const Date& d);
	bool operator>(const Date& d);
	bool operator>=(const Date& d);
	bool operator==(const Date& d);
	bool operator!=(const Date& d);

	Date& operator+=(int day);
	Date operator+(int day);

	Date& operator-=(int day);
	Date operator-(int day);
	
	Date& operator++();
	Date operator++(int);

	Date& operator--();
	Date operator--(int);

	int operator-(const Date& d);
private:
	int _year;
	int _month;
	int _day;
};


ostream& operator<<(ostream& out, const Date& d);
istream& operator>>(istream& in, Date& d);

